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| 型号： | KITMMA955XLEVM |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 11/26页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MMA955XL |
| 标准包装： | 1 |
| 传感器类型： | 加速计，3 轴 |
| 传感范围： | ±2g，4g，8g |
| 接口： | I²C |
| 灵敏度： | 0.061mg/LSB，0.122mg/LSB，0.244mg/LSB |
| 嵌入式： | 否 |
| 已供物品： | 2 个板，线缆，文档 |
| 已用 IC / 零件： | MMA955XL |
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Place 0.01 to 0.1 μF capacitors as close as possible to the package supply pins to meet the minimum bypass requirement.
The recommended bypass configuration is to place one bypass capacitor on each of the V DD /V SS pairs. V DDA /V SSA ceramic
and tantalum capacitors tend to provide better tolerances.
Ensure that capacitor leads and associated printed-circuit traces that connect to the chip V DD and V SS (GND) pins are as
short as possible.
Bypass the power and ground with a capacitor of approximately 1 μF and a number of 0.1-μF ceramic capacitors.
Minimize PCB trace lengths for high-frequency signals. This is especially critical in systems with higher capacitive loads that
could create higher transient currents in the V DD and V SS circuits.
Take special care to minimize noise levels on the V DDA and V SSA pins.
Use separate power planes for V DD and V DDA and separate ground planes for V SS and V SSA . Connect the separate analog
and digital power and ground planes as close as possible to power supply outputs. If both analog circuit and digital circuits
are powered by the same power supply, it is advisable to connect a small inductor or ferrite bead in series with both the V DDA
and V SSA traces.
Physically separate the analog components from noisy digital components by ground planes. Do not place an analog trace
in parallel with digital traces. It is also desirable to place an analog ground trace around an analog signal trace to isolate it
from digital traces.
Provide an interface to the BKGD/MS pin if in-circuit debug capability is desired.
Ensure that resistors R P1 and R P2 , in the following figure, match the requirements stated in the I 2 C standard. For the shown
configuration, the value of 4.7 k ? would be appropriate.
3.4.3
MMA955xL Platform as an Intelligent Slave
I 2 C
pullup resistors, a ferrite bead, and a few bypass capacitors are all that are required to attach this device to a host platform.
The basic configurations are shown in the following two figures. In addition, the RGPIO pins can be programmed to generate
interrupts to a host platform in response to the occurrence of real-time application events. In this case, the pins should be routed
to the external interrupt pins of the CPU.
Figure 4. Platform as an I 2 C slave
MMA955xL
Sensors
Freescale Semiconductor, Inc.
11
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